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When you are using 3G, the battery life is very weak (I get maybe three or four days). However, when you are using WiFi or nothing at all, the battery life is about the same for both Kindles. As HarryT says, only enable wireless when you need it (buying books).
You can either turn on or turn off wireless. Wireless includes both WiFi and 3G. The Kindle 3G automatically switches to 3G when it can't find any recognized WiFi access points.
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